Investigating Acceptable Level of Travel Demand before Capacity Enhancement for Signalized Urban Road Networks

IF 0.8 4区 工程技术 Q4 ENGINEERING, CIVIL Teknik Dergi Pub Date : 2020-03-01 DOI:10.18400/tekderg.464260
Ö. Baskan, Huseyin Ceylan, Cenk Ozan
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引用次数: 2

Abstract

Increasing travel demand in urban areas triggers traffic congestion and increases delay in road networks. In this context, local authorities that are responsible for traffic operations seek to strike a balance between traffic volume and capacity to reduce total travel time on road networks. Since intersections are the most critical components of road networks in terms of safety and operational issues, adjusting intersection signal timings becomes an effective method for authorities. When this tool remains incapable of overcoming traffic congestions, authorities take expensive measures such as increasing link capacities, lane additions or applying grade-separated junctions. However, it may be more useful to handle road networks as a whole by investigating the effects of optimizing signal timings of all intersections in the network. Therefore, it would be useful to investigate the right time for physical improvements on the road network to avoid premature investments considering limited resources of local authorities. In this study, effects of increasing travel demand on Total Travel Cost (TTC) is investigated by developing a bi-level programming model, called TRAvel COst Minimizer (TRACOM), in which the upper level minimizes the TTC subject to the stochastic user equilibrium link flows determined at the lower level. The TRACOM is applied to Allsop and Charlesworths’ network for different origin-destination demand matrix multipliers. Results revealed that TTC values showed an approximate linear increase while the travel demand is increased up to 16%. After this value, TTC showed a sudden spike although the travel demand was linearly increased that means optimizing signal timings must be supported by applying psychical improvements.
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在提升信号化城市道路网络容量前,研究可接受的交通需求水平
城市地区日益增长的出行需求引发了交通拥堵,并增加了道路网络的延误。在这方面,负责交通运营的地方当局寻求在交通量和能力之间取得平衡,以减少道路网络上的总旅行时间。由于交叉口是道路网络安全和运营问题中最关键的组成部分,因此调整交叉口信号配时成为当局的有效方法。当这一工具仍然无法克服交通拥堵时,当局就会采取昂贵的措施,如增加路段容量、增加车道或采用等级分隔路口。然而,通过研究路网中所有交叉口信号配时优化的效果,将路网作为一个整体来处理可能更有用。因此,在考虑到地方当局资源有限的情况下,调查改善道路网络的适当时间以避免过早投资将是有用的。在本研究中,通过建立一种称为旅行成本最小化(TRACOM)的双层规划模型,研究了旅行需求增加对总旅行成本(TTC)的影响,在该模型中,上层根据下层确定的随机用户均衡链路流最小化TTC。将TRACOM算法应用到Allsop和charlesworth的网络中,得到了不同的出发地需求矩阵乘数。结果表明,随着出行需求的增加,TTC值呈近似线性增长,最高可达16%。在这个值之后,TTC显示出一个突然的峰值,尽管旅行需求是线性增加的,这意味着优化信号授时必须通过应用心理改进来支持。
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来源期刊
Teknik Dergi
Teknik Dergi 工程技术-工程:土木
自引率
30.80%
发文量
65
审稿时长
>12 weeks
期刊介绍: The scope of Teknik Dergi is naturally confined with the subjects falling in the area of civil engineering. However, the area of civil engineering has recently been significantly enlarged, even the definition of civil engineering has somewhat changed. Half a century ago, engineering was simply defined as “the art of using and converting the natural resources for the benefit of the mankind”. Today, the same objective is expected to be realised (i) by complying with the desire and expectations of the people concerned and (ii) without wasting the resources and within the sustainability principles. This change has required an interaction between engineering and social and administrative sciences. Some subjects at the borderline between civil engineering and social and administrative sciences have consequently been included in the area of civil engineering. Teknik Dergi defines its scope in line with this understanding. However, it requires the papers falling in the borderline to have a significant component of civil engineering.
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